EP 0476754 A1 19920325 - Microprocessor-controlled apparatus including an antitheft protection means which can be disabled.
Title (en)
Microprocessor-controlled apparatus including an antitheft protection means which can be disabled.
Title (de)
Mikroprozessorgesteuerter Apparat mit ausschaltbarem Schutz gegen unbefugten Gebrauch.
Title (fr)
Appareil à commande par microprocesseur muni d'un dispositif de protection déconnectable.
Publication
Application
Priority
NL 9002035 A 19900917
Abstract (en)
Microprocessor-controlled apparatus, for example, a car radio whose microprocessor (5) is one-time programmable by the manufacturer of the apparatus. An external non-volatile memory (7) comprises a security variable (VAR) indicating whether the protection means is operational. In addition to a security code (SC), an arbitrary code series (KEY) of, for example, 20 bits is stored in the internal memory (51) of the microprocessor (5). Unauthorized disabling of the protection means by external interrogation of the non-volatile memory (7) is only possible by assigning a value which corresponds to the code series (KEY) to the security variable. However, the code series (KEY) is inaccessible and can only be traced with great difficulty by means of trial and error methods. <IMAGE>
IPC 1-7
IPC 8 full level
B60R 11/02 (2006.01); G06F 1/00 (2006.01); G06F 12/14 (2006.01); G06F 21/24 (2006.01); G06F 21/60 (2013.01); G06F 21/62 (2013.01); G06F 21/88 (2013.01); G07C 9/00 (2006.01); G08B 13/00 (2006.01); G08B 13/22 (2006.01); H04B 1/06 (2006.01); H04B 1/16 (2006.01)
CPC (source: EP KR US)
G06F 1/00 (2013.01 - KR); G07C 9/0069 (2013.01 - EP US); G07C 9/33 (2020.01 - EP US)
Citation (search report)
- [YD] US 4494114 A 19850115 - KAISH NORMAN [US]
- [Y] EP 0350119 A1 19900110 - PHILIPS NV [NL]
- [AD] NL 8304138 A 19850701 - PHILIPS NV
- [A] DE 3723931 A1 19880616 - DIGATEC ELECTRONIC SYSTEMS [DE]
- [A] US 4604708 A 19860805 - LEWIS GAINER R [US]
- [A] FR 2611623 A1 19880909 - CLARION CO LTD [JP]
- ELEKTRONIK, vol. 27, no. 13, November 1978, MÜNCHEN, DE, page 46; LIELL: 'PROGRAMMIERBARES CODESCHLOSS MIT DOPPELTER VERRIEGELUNG'
- IBM TECHNICAL DISCLOSURE BULLETIN. vol. 25, no. 4, September 1975, NEW YORK, US, pages 1975 - 1977; COMPTON: 'THEFT PROTECTION FOR TYPEWRITERS'
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0476754 A1 19920325; EP 0476754 B1 19950315; DE 69108153 D1 19950420; DE 69108153 T2 19951026; HK 76396 A 19960510; JP 3133106 B2 20010205; JP H0683471 A 19940325; KR 100240353 B1 20000115; KR 920006964 A 19920428; NL 9002035 A 19920416; US 5245330 A 19930914
DOCDB simple family (application)
EP 91202321 A 19910911; DE 69108153 T 19910911; HK 76396 A 19960502; JP 23462391 A 19910913; KR 910016046 A 19910914; NL 9002035 A 19900917; US 75709691 A 19910910